Talking about this isolate function, I'm actually using this script :

script:moi.geometryDatabase.invertSelection(); moi.geometryDatabase.hide( true );

I just find a little problem when you want to isolate curve that are in edit mode (show points activated), using this script on this kind of curve make the curve dissapear (hidden). I have to admit I don't need to isolate that kind of curve often, but it's probably cool to fix this behavior.